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diff --git a/Documentation/git-filter-branch.txt
b/Documentation/git-filter-branch.txt
index dfd12c9..2664cec 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -329,6 +329,19 @@ git filter-branch --msg-filter '
' HEAD~10..HEAD
--------------------------------------------------------
+You can modify committer/author personal information using `--env-filter`.
+For example, to update some developer's email address use this command:
+
+--------------------------------------------------------
+git filter-branch --env-filter '
+ if [ $GIT_AUTHOR_EMAIL = j...@old.example.com ]
+ then
+ GIT_AUTHOR_EMAIL=j...@new.example.com
+ fi
+ export GIT_AUTHOR_EMAIL
+' -- --all
+--------------------------------------------------------
+
To restrict rewriting to only part of the history, specify a revision
range in addition to the new branch name. The new branch name will
point to the top-most revision that a 'git rev-list' of this range
--
1.7.11.7
--
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